Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image of the right side;

FIG. 3 is a top front perspective view thereof as viewed from the right side;

FIG. 4 is a top rear perspective view thereof as viewed from the left side;

FIG. 5 is rear elevational view thereof;

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a clock, as shown and described. 